🛠️ Functions in Rust

📌 Defining a Function

• Function names use snake_case by convention
• Call a function with its name and parentheses

📥 Parameters

🎁 Return Values

✅ The last expression in a function is the return value—no return needed unless you want to return early.

If you do use return, add a semicolon:

❌ But if you end with an expression, do not use a semicolon:

⚙️ Statements vs Expressions

• Statements do something but return nothing (e.g., let x = 5;).
• Expressions evaluate to a value (e.g., 5 + 2, x * y, blocks like ).

Since Rust is expression-oriented, you can use blocks to return values:

💡 Why Functions Matter

• Make your code easier to read and maintain
• Help you organize logic into small, testable chunks
• Allow you to reuse behavior across your app

Rust also supports advanced patterns like:

• Function pointers
• Closures (anonymous functions)
• Higher-order functions

…but we’ll get there later 😎

🧠 Summary

• Define functions with fn
• Use parentheses () for parameters
• Return values with -> and no semicolon on the last line
• Embrace expressions—Rust loves them!

Mastering functions early will unlock a lot of power in your Rust journey 🦀